Compact and portable battery converter box for on the go use. For electronics and various situations that require Csize power. The AA battery holder is a set of 4 AA to C battery adapter converter cases. These professional and practical adapters are specially used to convert any size AA to C size for use. Just put 1 AA battery into the converter, and it will function the same as a Csize battery. With a built in battery limit slot to fix the battery in place for secure operation. Key benefits and features Functionality: converts any AA battery to a Csize battery for use in devices that require C cells. Compatibility: designed to work with devices that normally use Csize power. Size and portability: small, compact, and easy to carry. Set contents: includes 4 AA to C battery adapters in one package. Secure fit: built in battery limit slot keeps the battery fixed securely during use. Performance: enables quick power replacements when C cells are unavailable, with reliable operation when the AA is properly seated. Use scenarios Travel, camping, or emergency kits: substitute AA batteries for Csize devices such as flashlights, radios, or portable fans when C batteries are not on hand. Electronics projects and DIY: convenient power solution for prototypes or projects that require Csize power but are supplied with AA cells. Household devices: common devices that use C batteries can be powered from readily available AA batteries, reducing the need to stock multiple battery sizes.